Yes, and that is what makes these computers so great. You can have it either way. Place them on a table or another setup for easy convenience and access

Not really.
Predseda mentioned Pinball Dreams because you need the keyboard to play. In that situation, this setup is completely cumbersome.
Also the C64 needs the keyboard heavily, to type in commands to load and to skip cracktros.

They are computers, not consoles, therefore not really convenient in this setup.

But whatever satanic ritual you are performing here with them, good job